The misconception on modern solid state flippers is calling the switch and end of stroke switch. It's really a flipper bat is raised switch. The game *does* have EOS switches. This is the sole reason EOS switches exist on these flipper designs. The ball hits the flipper bat as it is in the up position and knocks it down. It's the EOS switch that tells the CPU to give another high powered burst to re-raise the flipper bat. It's likely your game has had them removed by previous owner. This is actually common.

You're looking in the wrong place. There are only 2 flipper prongs on a data east / sega / stern flipper coil. There is no lower flipper hold voltage in these systems to test or fix. The hold is a function of pulsing the high power weaker to not burn up the coil.